US2855474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D. c.-a. c. inverters
Assignee: Licentia Patent Verwaltungs GmbH
•
Filing: 1956-07-06
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Granted: 1958-10-07
•
Expires: 1976-07-06
Abstract
No abstract record available.
Inventors
- 👤 Bohm Hellmuth
- 👤 Bettin Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:54
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2163507A
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US688068A
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US866289A
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US895044A
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US940069A
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DE334301C
Cited
US2195909A
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US2444687A
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US2795662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |